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Application Introduction

Use NDT Force Sensor to implement bezel-side key functionality without destroying the bezel structure.

 

When light touch the bezel, NDT force sensor will converts micro-deformations into recognizable voltage signals, that the system can recognize the user's touch operation by collecting and processing the signal.

 

With the motor vibration feedback, the side key can also achieve the true button experience.

 

Compared with mechanical keys, NDT side key solution can delivers linear pressure values for multi-level (light / medium / heavy) pressure operation as well as Tap / Double Tap / Sliding and more….

Applications

  • Integral forming frame to realize industrial design innovation
  • Improve smartphone waterproof performance
  • Specific function keys, multi-pressure interaction

Solutions

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Features:

Ultra-thin size. Thickness less than 1mm, width can be as low as 2mm

High sensitivity, support 3mm bezel thickness, minimum activation force 50g and force resolution 15g

Multi-channel linear output with independent channel

“Peel & Stick” force sensor, easy to install and simple process

Features & Advantages


NDT Micro Strain Gauge Force Capacitance / Inductance MEMS
Theory Detected panel strain/curvature changes are resulting in resistance changes, Capacitance changes or inductance resonant frequency changes are caused by spacing variation The change in the spacing between the measuring panel and the fixed position results in the extrusion of the contact point of the MEMS
Installation structure

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Single-layer FPC structure, attached directly to the back of the panel

Double-layer structure, using support structure to control the gap

Need to ensure a spacing between the panel and the fixed position

Appearance Dimension Flexible FPC,dimension can be customized; Maximum thickness 0.18mm(including tape DST&FPC) 0.6mm Thickness 0.6mm Thickness
Assembly process Back of FPC double-sided adhesive(VHB) directly attached to the back of the panel Double-sided attached Plug-in assembly
Summarize

Direct detection of panel deformation without gap control, product consistency/ high reliability

 

Single-sided attached process and simple assembly

Need to strictly control the gap, easily affected by assembly tolerances and drop/deformation, poor consistency/reliability

 

Double-sided attached process and complex assembly

Need strong tightness support, easy to be affected by assembly tolerances and drop/deformation, poor consistency/reliability

 

Plug-in assembly process and complex assembly

Success stories

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